package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {


    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;


    /*
    * 刚开始这个接口我想不通 到底返回什么 后来清晰了 这个接口对应用户端那个加号 也就是专注前端到底传来什么*/
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //先来判断该物品是否在购物车内（动态sql）
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();//一次请求是一个线程
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //要么查不到，要么查到一条数据\
        //如果存在，则数量加
        if(list != null && list.size() > 0) {
            //有的话就只有一条数据，取第一条数据就行
            ShoppingCart shoppingCart1 = list.get(0);//get(0)就是取出第一条数据
            shoppingCart1.setNumber(shoppingCart1.getNumber() + 1);
            //再更新数据库
            shoppingCartMapper.updateByNumberId(shoppingCart1);
        }else{
            Long dishId = shoppingCart.getDishId();

            if(dishId != null){
                //查询dish
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //此时直接添加套餐就行
                Long setmealId = shoppingCart.getSetmealId();

                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            //共有属性
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    //查看购物车
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //通过线程获取微信登陆用户id（线程里携带了）
        //查看当前用户的购物车，返回list数组。
        //这里的查询方法是前面写的动态查询 更加通用
        Long currentId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(currentId);
        return shoppingCartMapper.list(shoppingCart);
    }

    @Override
    public void clean() {
        Long currentId = BaseContext.getCurrentId();
        shoppingCartMapper.clean(currentId);

    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                //只删除这一项数据，依据主键id而不是用户id
                shoppingCartMapper.delete(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateByNumberId(shoppingCart);
            }
        }
    }
}
